Calibration warning apparatus

Details Calibration warning apparatus Calibration warning apparatus

G - Physics

07

C

340/77, 73/0.5

G07C 3/00 (2006.01) G01K 3/04 (2006.01) G01K 7/02 (2006.01) G01K 15/00 (2006.01)

Patent

CA 1217950

ABSTRACT This invention relates to apparatus for use with a measuring or reference device, the apparatus providing a calibration warning in response to extended use of the device. The invention is primarily intended for use with a thermocouple operating at high or constant temperatures. In more detail the invention provides a calibration warning apparatus for use with an electrical sensor comprising an analog indicating device coupled to an analog driving circus the circuit being responsive to the output of the sensor such that the reading provided by the indicating device is a function both of the sensor output end elapsed time.

449192

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